How about some habanero peppers? This evil-looking black bag houses tiny rings of fire. The actual snack isn't too spicy, but it does have a kick. The real power comes in that little red envelope attached to the bag.
Inside that envelope is spicy powder - very fine powder, which you can see on the picture of the snacks themselves. And while that powder isn't too spicy in my mouth or stomach, it's fine enough that it finds its way into your sinuses, and that's where the kick comes from. It's almost like sticking that powerfully spicy Chinese mustard directly into your nose. It's a good snack, but I wish that powder wasn't so powdery!